I experienced the same issues: Importing Pure (e50312982ba0) the following "freezes" the IDE in the sense Manuel described.

lemma "PROP P"
  apply (rule ?)+

It works fine in Isabelle2018. Also note that

lemma "PROP P"
  by (rule ?)+

works fine in e50312982ba0, as well.

Fabian

On 9/7/2018 11:51 AM, Manuel Eberl wrote:
I have also noted a few strange issues with the development version (currently e50312982ba0) these last few days, but I have not yet had the time to try to reproduce them.

Basically, what happens is that occasionally, the IDE "freezes" in the sense that no new changes to the document are processed. I can still view the output of all the processed commands, but there is a certain position in the document underneath which all the text is red, and it never because not red. If I change anything in the text before that, it also becomes red forever.

It seems to me that this is particularly triggered by non-terminating invocations of simp/auto/etc., even if I abort them after a fraction of a second.

I don't think the 2018 release had this problem, but I could be wrong.

If I find out any more precise details, I will let you know.

Manuel


On 07/09/2018 17:39, Lawrence Paulson wrote:
What do you suggest for these on a 16 GB machine? I attach my file.
Larry

On 7 Sep 2018, at 15:01, Makarius <makar...@sketis.net <mailto:makar...@sketis.net>> wrote:

If you are using the 64-bit version of Poly/ML, you should give both
--minheap and --maxheap, otherwise it tends to overcommit a lot of memory.





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